Telephone set



Dec. 24, 1935. CK AL v 2,025,398

TELEPHONE SET Filed Dec. 19, 1933 2 Sheets-Sheet l Qmmvsimm L C. POCOCK INVENTORS Hi TURTON A 7' TORNE V 1386- 1935. 1.. c. POCOCK ET AL.

TELEPHONE SET Filed Dec. 19, 1933 2 Sheets-Sheet 2 FIG. 3

L.'C.POC'OCK H.J. TURTON lNVEA/TORS ATTORNEY Patented Dec. 24, 1935 UNITED STATES PATENT OFFICE TELEPHONE SET Application December 19, 1933, Serial No. 703,051 In Great Britain January 18, 1933 8 Claims.

This invention relates to microtelephonic headsets, for operators, for instance.

' Normally an operator is provided with a single receiver mounted on a headband, and a transmitter with a horn-like mouthpiece which is carried on the chest by means of a harness.

This arrangement has a number of disadvantages, one of which is that the harness has a tiring effect on the neck muscles, and another of which is that when the operator moves her head, the efliciency of the transmitter varies greatly.

The object of the present invention is to provide an operators or like telephone set which is more simple in construction, lighter in weight,

which obviates the fatigue attendant on the use of the present type of operator's telephone set and in which the position of the transmitter relative to the mouth is not varied by movements of the head.

It has previously been proposed to mount the operator's transmitter assembly on the headband carrying the receiver or receivers, thus forming a microtelephonic headset, but the constructions proposed have been cumbersome, and so far as we are aware have never been used in practice.

According to one feature of the invention an unenclosed microphone capsule is mounted on an arm supported by a receiver headband. By microphone capsule is meant the microphone unit which is usually enclosed in for instance the transmitter casing of a handset and access to which for the sound waves is usually given via a transmitter mouthpiece.

According to another feature of the invention a transmitter is mounted on an arm carrying a clip adapted to embrace the receiver casing so that the transmitter assembly can be fitted to existing headsets.

According to a further feature of the invention,

a microtelephone headset comprises a single receiver and a transmitter carrying arm which is so shaped and so jointed to the transmitter and to the headset that the transmitter can be arranged in the correct position for speech when the receiver is worn on either ear.

According to yet another feature of the invention a microtelephonic headset, including transmitter, supporting arm, receiver, headband and leads, is so constructed and arranged that every portion of its surface which is liable to be touched during use is electrically dead.

The invention will be more clearly understood from the following description of one embodiment of the invention shown in the accompanying drawings in which:-

Fig. 1 shows a general view of an operator's microtelephonic headset,

Fig. 2 shows in cross-section the microphone capsule and the joint connecting the capsule to the supporting arm,

Fig. 3 shows in front and side elevation the clip by which the transmitter-carrying arm is mounted on the receiver casing and the joint connecting the clip to the transmitter-carrying arm.

The headband I carries an ear or head contact- 10 pad 2 and a receiver casing 3. On the receiver casing is mounted a clip 1 which is connected to a tubular arm 4 by a ball-joint 8. A microphone capsule 5 is rotatably connected to the arm 4. The receiver leads of the four-conductor cord 9 15 are connected direct to the receiver terminals which are enclosed in known manner, but the transmitter leads are connected to a terminal plate carried by the clip 1. Leads from the terminal plate pass through the ball of the ball-joint 20 8 and the arm 4 to the microphone.

Referring to Fig. 2, the capsule is of the type described in British Patent No. 348,716, complete acceptedMay 21, 1931, comprising a back electrode l5 fixed to the capsule casing, a silk granule 25 chamber I6 fixed to diaphragm l8 which is apertured to receive the front electrode IT. The capsule is mounted on a cup-shaped insulating block l3 by rivets 23. The diaphragm i8 is mounted between clamping rings which are insulated from 30 the casing by a cellulose acetate or silk disc and a paper cup IS. A contact ring 20 is positioned between the paper cup l9 and one of the clamping rings and an extension 24 thereof rests on an insulating block and bush 25 and is connected to a 35 terminal 2| by one of the rivets 23 which is insulated from the capsule casing by the bush 25. The block I3 is peripherally grooved to receive a metal cylinder -Il enclosing the terminal 2| electrically connected to the diaphragm and the terminal I4 40 electrically connected to the back electrode by a bolt passing through the block l3 and through an oversize hole in the capsule casing. Punched-out positioning lugs 26 on the capsule casing engage recesses in an insulating spacing block 21 sur- 45 rounding the bolt. The back of the cylinder H is closed and the cylinder held in position by an insulating disc l2 screwed to the block l3. A tubular member 6 has splayed ends partially embracing the cylinder H and riveted thereto. The member 6 receives one end of the arm 4 and a rivet l0 passes through the member 6 and slots in the arm 4 of such a length as to allow 50 degreerotation of the arm in the member 6.

Referring to Fig. 3, the ends of the clip 1 ar 6:

turned in to form a seating for a terminal plate I1 and have parallel extensions 18. A square plate 84 is riveted to each extension 88 with its side diagonal to the axis of the extension. Apertures ll are formed in each extension I! and each plate 34, and other apertures are formed in each piateandextension when the members are riveted together. The terminal plate I1 is screwed at each end to the seating on the clip, the screws also carrying terminals to which are connected the transmitter leads of the cord, and which are protected from contact with the wearer by the clip. A ball and sleeve 80, ll is mounted on the end of the arm 4 and is riveted thereto. A projection II is formed on the sleeve ii to cooperate with the shaped extensions 33 of the clip to restrict rotation to The restriction of rotation is to prevent injury to the leads. The ball 39 is positioned between the plates ll engaging them in the apertures ll and the plates are drawn together by bolts 36 sufiiciently to hold the ball joint in adjusted position. Leads 30 connected to the terminals on plate 31 pass through the tubular arm 4 and are connected to the terminals l4, 2|, Fig. 2. It will be observed that every portion of the surface of the headset is electrically dead.

The arm, joints, and transmitter capsule casing are made of aluminium or aluminium alloy. The transmitter attachment is thereby made very light in weight, the additional load carried by the head being very small. It will be seen that by swivelling the arm 4 about the universal joint and rotating the capsule I on the am, it can be positioned in front of the arm when the receiver is on the right ear and when the receiver is on the left ear.

What is claimed is:

1. In combination, a microphone capsule, a rod-like member, a receiver clip, a terminal block of insulating material supported by said clip, said rod-like member being hollow for the passage of conductors between the capsule and the terminal block, and a swivel connection, said capsule being adjustably secured to one end of said member, and said receiver clip being secured to the other end of said member through said swivel connection.

2. In combination, a microphone capsule, a rod-like member, a receiver clip for engagement with a receiver to be held against either ear of a user, said clip having a pair of depending spaced portions, and a swivel connection between said spaced portions and having a projection for engagement with the spaced portions to limit the degree of rotation of the swivel connection, said capsule being adjustably secured to one end of said member, and said receiver clip being secured to the other end of said member through said swivel connection.

3. In combination, a microphone capsule, a rod-like supporting member, a receiver clip, a terminal block supported on said receiver clip, and a hollow ball joint connection, said capsule being adjustably secured to one end of said member, and said clip being coupled to the other end low such a receiver, and a swivel connection, said capsule being adjustably secured to one end oi! said member, and said clip being coupled to the other end of said member through said connection. l5

5. In combination, a microphone capsule, a rod-like member, and a band member to be clamped around a receiver to be held against the user's ear, such capsule being secured toone end and said band member to the other end of said 20 rod-like member, and said band member having a shelf portion and a terminal block of insulating material supported on said shelf portion, said rod-like member being hollow for the e ofconductors between the capsule and the terminal 25 block.

6. In combination, a microphone capsule, a receiver clip comprising arcuate portions for engagement with a receiver to be held against a users ear, planar horizontal portions defining a 30 shelf portion beneath such a receiver, and planar vertical portions immediately below said shell portion, swivel means supported on said planar. vertical portions, and a one-piece, rod-like member connected with said swivel means at one end, 35 and supporting said capsule at its other end.

7. In combination, a microphone capsule. a receiver clip comprising arcuate portions for engagement with a receiver to be held against a user's ear, planar horizontal portions deflning a 40 shelf portion beneath such a receiver, and plans: vertical portions depending from said shelf portion, swivel means supported on said planar vertical portions, a rod-like member connected with said swivel means at one end and supporting 45 said capsule at its other end, and a projection on said swivel means for engagement with said planar vertical portions of the clip to limit the swivel to a range of 180 degrees.

8. In combination, a microphone capsule, a 50 receiver clip comprising arcuate portions for engagement with a receiver to be held against a user's ear, planar horizontal portions defining a shelf portion beneath such a receiver, and planar vertical portions depending from said shelf por- 55 tion, swivel means supported on said planar vertical portions, a rod-like member connected with said swivel means at one end and supporting said capsule at its other end, said capsule being adjustable through an angle of 50 degrees, and a projection on said swivel means for engagement with said planar vertical portions of the clip to limit the swivel to a range of 180 degrees.

LYNDALL c. POCOCK. HAROLD J. TURTON. 

